Rated 3 out of 5 stars

I love the idea of this, since Thunderbird's dark theme implementation is really poor. However, it suffers from a major shortcoming - it changes the message from white to black AFTER it loads, so every time you change messages, you're hit with a bright flash of white for a moment (in Thunderbird 102.x). Unfortunately, that bright flash with every message is worse than just using the light theme. :(

If that one issue were resolved, this would be a five-star extension, easily.

This review is for a previous version of the add-on (3.4).